Type used to reference logical and physical entities. Token may be extended by intermediate terminal with adding prefix to make it global unique. The length should be within 36 characters for generating as a local token. See "Remote Token" section in Resource Query specification. General datastructure referenced by a token. Should be used as extension base. A service-unique identifier of the item. Type used for names of logical and physical entities. Description is optional and the maximum length is device specific. If the length is more than maximum length, it is silently chopped to the maximum length supported by the device/service (which may be 0). Type used to represent the numbers from 1 ,2 , 3,... Attributes contains a Name and an optional Value and type. Name of attribute. Key names starting with "ONVIF" (any case) are reserved for ONVIF use. Value of attribute Recognition/identification types supported by ONVIF. A credential number is used for recognition/identification. A PIN code is used for recognition/identification. A fingerprint is used for recognition/identification. A face is used for recognition/identification. An iris is used for recognition/identification. A vein is used for recognition/identification. A palm is used for recognition/identification. A retina is used for recognition/identification. A license plate is used for recognition/identification. A request-to-exit button is used for anonymous recognition (but not for identification).